Imaging device

An imaging device comprising:

• an image sensor that converts an optical image captured by a plurality of pixels arranged in an array on an imaging surface into an image signal and outputs the converted image signal;
• a modulation unit provided on a light-receiving surface of the image sensor to modulate an intensity of light;
• and
• an image processing unit that performs image processing on an output image output from the image sensor,
• wherein the modulation unit has a grating substrate, and
• a first grating pattern formed on a first surface of the grating substrate facing a surface close to the light-receiving surface of the image sensor,
• the first grating pattern includes a plurality of concentric circles whose pitches are inversely proportional to a distance from an origin point of at least one set of reference coordinates,
• the plurality of concentric circles does not overlap each other within the first grating pattern, and
• the reference coordinates are symmetrically disposed with respect to a normal line at a center of the light-receiving surface.